Precious stone



FIG. 1 is a first perspective view of a precious stone showing my new design;

FIG. 2 is a second perspective view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a side view of FIG. 1, all other side views being symmetrical; and,

FIG. 5 is a bottom view of FIG. 1 

CLAIM The ornamental design for a precious stone, as shown and described. 